Thon,
Thanks for the advice. I hadn't considered shielded 2 conductor. Seems to be about the same cost as the RG59. What specs on shielded 2 or 4 conductor would be good for mid-fi?
I can't order already-terminated cable since this is basically being routed through the garage under my apartment and needs to be able to be fished through the floor. Plus it's awfully hard to find good quality interconnects that are 50' long. The actual distance between entry and exit is more like 30-40' depending on routing, so I should have plenty of extra slack with a 50' cable.
As for the centerpin connectors, they aren't so much crimpless as uniquely-crimped. Check out their animation at www.centerpin.com, seems like a solid enough connection. Anyone have any experience with Centerpin's connectors?

-- Dave